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T2分布提供了有關(guān)儲(chǔ)層巖石和流體性質(zhì)非常有用的信息，這也是NMR測(cè)井圖上的基本輸出。NMR測(cè)井的其他輸出大部分可根據(jù)T2分布計(jì)算出來。根據(jù)NMR回波數(shù)據(jù)計(jì)算出的T2分布可用來計(jì)算NMR總孔隙度、束縛流體孔隙度和自由流體孔隙度，也能用來計(jì)算滲透率、評(píng)價(jià)儲(chǔ)層質(zhì)量。通過將自旋回波信號(hào)擬合成大約3O個(gè)單指數(shù)方程來計(jì)算T2分布。每個(gè)指數(shù)方程都具有幅度A(T2)和相應(yīng)的衰減時(shí)間T2。擬合過程由數(shù)學(xué)反演技術(shù)來實(shí)現(xiàn)。反演結(jié)果是幅度A(T2)，單位為孔隙度單位，對(duì)應(yīng)于每個(gè)T2值。A(T2)對(duì)T2的半對(duì)數(shù)圖稱為 分布。T2分布以下的面積等于NMR總孔隙度。
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